Best way to define mapping

Hi
I am evaluating Kodo in the prospect to migrate an existing application
which uses a different JDO implementation and I am currently wondering
what is the best way to define the mapping.
So far, we have only used __.jdo__ metadata file with default values and
some jdo extension. Then we delegate to the JDO implementation the task to
define the schema and create it in the relationnal database.
I am trying to reproduce the same process with KODO. But :
- I am encountering some problem with the kodo extension.(but they are
certainly some mistake from my part, I will introduce some at the end of
this email)
- I understand that kodo can use a mapping file.
Here are my very first questions
- Which method should I use. Only JDO extension, or mapping file.
- if I use the mapping file, is it possible to only specify info for
fields which are different than default behavior of kodo
- If I use the jdo extension only how can I :
specify the name of a table for a particular class?
specify the name of a join table?
Specify the name of a column for a particular java field?
Is there a way to configure the mapping tool to use a custom naming
convention for the whole project (for a particular package)?
I already made a small evaluation of kodo 7 month ago with version 3.1.0,
but with this version, there was a bug discussed in this forum which
forced me to use the mapping file. But I had to define the complete
mapping, which was a huge task especially when you have to repeat field
mapping for sub classes. My first tests with kodo 3.2.2 works with jdo
extension, but I still have some issues as you can see from my questions.
Thank you for your answer.
Nicolas GANDRIAU
Environment description
Kodo 3.2.2 evaluation
MySQL 4.1.4-gamma'-Max'
MySQL Connector/J 3.0.15-ga
JDK 1.4.2_05 de Sun
Linux Kernel 2.6.8 (Mandrake 10.1)
IDEA 4.5.2

Nicolas,
You need to define which mapping file using the kodo.jdbc.MappingFactory
extension. Note that with either format that the mapping information
must be complete (or you can have Kodo create them for you):
http://solarmetric.com/Software/Documentation/3.2.2/docs/ref_guide_conf_kodo.html#kodo.jdbc.MappingFactory
The metadata mapping factory is more verbose though all of your
information is in a single file. .mapping files are more consise but
need to be deployed in addition to your .jdo metadata.
Nicolas GANDRIAU wrote:
Hi
I am evaluating Kodo in the prospect to migrate an existing application
which uses a different JDO implementation and I am currently wondering
what is the best way to define the mapping.
So far, we have only used __.jdo__ metadata file with default values and
some jdo extension. Then we delegate to the JDO implementation the task to
define the schema and create it in the relationnal database.
I am trying to reproduce the same process with KODO. But :
- I am encountering some problem with the kodo extension.(but they are
certainly some mistake from my part, I will introduce some at the end of
this email)
- I understand that kodo can use a mapping file.
Here are my very first questions
- Which method should I use. Only JDO extension, or mapping file.
- if I use the mapping file, is it possible to only specify info for
fields which are different than default behavior of kodo
- If I use the jdo extension only how can I :
specify the name of a table for a particular class?
specify the name of a join table?
Specify the name of a column for a particular java field?
Is there a way to configure the mapping tool to use a custom naming
convention for the whole project (for a particular package)?
I already made a small evaluation of kodo 7 month ago with version 3.1.0,
but with this version, there was a bug discussed in this forum which
forced me to use the mapping file. But I had to define the complete
mapping, which was a huge task especially when you have to repeat field
mapping for sub classes. My first tests with kodo 3.2.2 works with jdo
extension, but I still have some issues as you can see from my questions.
Thank you for your answer.
Nicolas GANDRIAU
Environment description
Kodo 3.2.2 evaluation
MySQL 4.1.4-gamma'-Max'
MySQL Connector/J 3.0.15-ga
JDK 1.4.2_05 de Sun
Linux Kernel 2.6.8 (Mandrake 10.1)
IDEA 4.5.2
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com

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    public Float stop=null;
    public Integer qty=null;
    public Replace() {
}and then a portion of my OrderExchange.java Enum looks like this:
class SymbolPair implements java.io.Serializable {
String symbol;
String suffix;
SymbolPair(String symbol, String suffix) {
    this.symbol = symbol;
    this.suffix = suffix;
public boolean equals(Object o) {
    SymbolPair x = (SymbolPair)o;
    return (this.symbol == x.symbol && this.suffix == x.suffix);
public int hashCode() {
    return (symbol + "." + suffix).hashCode();
public String toString() {
    if (suffix == null)
      return symbol;
    return symbol + "." + suffix;
public enum OrderExchange implements java.io.Serializable {
SIM("S", false, '.', OrderTIF.DAY) {
    public String getStandardizedStockSymbol(String symbol, String suffix) {
      return symbol + "." + suffix;
    public SymbolPair getExchangeSpecificStockSymbol(String symbol) {
      return new SymbolPair(symbol, null);
TSX("c", false, '.', OrderTIF.DAY) {
    public String getStandardizedStockSymbol(String symbol, String suffix) {
      String x = externalSymbolPairToInternalSymbolMap_GS.get(new SymbolPair(symbol, suffix));
      return x == null ? symbol : x;
    public SymbolPair getExchangeSpecificStockSymbol(String symbol) {
      SymbolPair sa = internalSymbolToExternalSymbolPairMap_GS.get(symbol);
      return sa == null ? new SymbolPair(symbol, null) : sa;
NYSE("N", false, '.', OrderTIF.DAY) {
    public String getStandardizedStockSymbol(String symbol, String suffix) {
      String x = externalSymbolPairToInternalSymbolMap_GS.get(new SymbolPair(symbol, suffix));
      return x == null ? symbol : x;
    public SymbolPair getExchangeSpecificStockSymbol(String symbol) {
      SymbolPair sa = internalSymbolToExternalSymbolPairMap_GS.get(symbol);
      return sa == null ? new SymbolPair(symbol, null) : sa;
ARCA("C", false, '.', OrderTIF.GTD) {
    public String getStandardizedStockSymbol(String symbol, String suffix) {
      String x = externalSymbolPairToInternalSymbolMap_GS.get(new SymbolPair(symbol, suffix));
      return x == null ? symbol : x;
    public SymbolPair getExchangeSpecificStockSymbol(String symbol) {
      SymbolPair sa = internalSymbolToExternalSymbolPairMap_GS.get(symbol);
      return sa == null ? new SymbolPair(symbol, null) : sa;
public abstract String getStandardizedStockSymbol(String symbol, String suffix);
public abstract SymbolPair getExchangeSpecificStockSymbol(String symbol);
private static Map<SymbolPair, String> externalSymbolPairToInternalSymbolMap_GS = new HashMap<SymbolPair, String>();
private static Map<SymbolPair, String> externalSymbolPairToInternalSymbolMap_ARCA = new HashMap<SymbolPair, String>();
private static Map<String, SymbolPair> internalSymbolToExternalSymbolPairMap_GS = new HashMap<String, SymbolPair>();
private static Map<String, SymbolPair> internalSymbolToExternalSymbolPairMap_ARCA = new HashMap<String, SymbolPair>();
private static Object[] toArrayOutputArray = null;
static {
    String SQL = null;
    try {
      Connection c = MySQL.connectToMySQL("xxx", "xxx", "xxx", "xxx");
      SQL = "SELECT symbol, ARCASYMBOL, INETSYMBOL, ARCASYMBOLSUFFIX, INETSYMBOLSUFFIX from oms.tblsymbolnew";
      Statement stmt = c.createStatement();
      ResultSet rs = stmt.executeQuery(SQL);
      while (rs.next()) {
        String symbol = rs.getString("symbol");
        if (rs.getString("ARCASYMBOL") != null) {
          if (!symbol.equals(rs.getString("ARCASYMBOL")) || rs.getString("ARCASYMBOLSUFFIX") != null) {
            String suffix = rs.getString("ARCASYMBOLSUFFIX");
            SymbolPair sp = new SymbolPair(rs.getString("ARCASYMBOL"), suffix);
            internalSymbolToExternalSymbolPairMap_ARCA.put(symbol, sp);
            externalSymbolPairToInternalSymbolMap_ARCA.put(sp, symbol);
    } catch (Exception e) {
      System.out.println(SQL);
      e.printStackTrace();
      System.exit(0);
static {
    populateSymbolToDestination();
static Logger logger = Logger.getLogger(OrderExchange.class);
private static HashMap<String, OrderExchange> symbolToDestination = new HashMap<String, OrderExchange>();
private final String tag100;
private final boolean usesSymbolSuffixTag;
private final char symbolSuffixSeparator;
private final OrderTIF defaultTif;
private static final String soh = new String(new char[] { '\u0001' });
private OrderExchange(String tag100, boolean usesSymbolSuffixTag, char symbolSuffixSeparator, OrderTIF defaultTif) {
    this.tag100 = tag100;
    this.defaultTif = defaultTif;
    this.usesSymbolSuffixTag = usesSymbolSuffixTag;
    this.symbolSuffixSeparator = symbolSuffixSeparator;
public OrderTIF getDefaultTif() {
    return defaultTif;
public String getTag100() {
    return tag100;
public char getSymbolSuffixSeparator() {
    return symbolSuffixSeparator;
public static OrderExchange getOrderExchangeByExchangeName(String name) {
    for (OrderExchange d : OrderExchange.values()) {
      if (d.toString().equalsIgnoreCase(name.trim())) {
        return d;
    return null;
Thanks,
Andrew

Hi Andrew
The only way to serialize object, so that they can be used by other languages than Java is to use the Portable Object Format.
The implementation of this requires you to implement the PortableObject interface in Java. PortableObject defines two methods
public void readExternal(PofReader reader);
public void writeExternal(PofWriter writer);
Also you need to add a POF config file that ties the type to a type id.
In C++ each type needs two template methods implemented to seralize and deserialize. But first it needs to register the data type with the same type id as for the Java type using the COH_REGISTER_MANAGED_CLASS macro.
Secondly analogs to Java implement the serializer stubs
template<> void serialize<Type>(PofWriter::Handle hOut, const Type& type);
template<> Type deserialize<Type>(PofReader::Handle hIn);
For C# your serializable types need to implement IPortableObject, with it's two methods:
void IPortableObject.ReadExternal(IPofReader reader);
void IPortableObject.WriteExternal(IPofWriter writer);
Similar to Java C# uses a POF configuration file, the same type id should bind to the corresponding C# type.
For more information see
POF Configuation: http://coherence.oracle.com/display/COH34UG/POF+User+Type+Configuration+Elements
C++: http://coherence.oracle.com/display/COH34UG/Integrating+user+data+types
C#: http://wiki.tangosol.com/display/COHNET33/Configuration+and+Usage#ConfigurationandUsage-PofContext
Hope that helps!
/Charlie
Edited by: Charlie Helin on Apr 30, 2009 12:31 PM

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